How I Met Your Mother (often abbreviated to HIMYM) is an American sitcom that originally ran on CBS from September 19, 2005, to March 31, 2014. The series follows the main character, Ted Mosby, and his group of friends in Manhattan. As a framing device, Ted, in the year 2030, recounts to his son and daughter the events that led him to meeting their mother. Wikipedia
(repeated line) Barney: Challenge accepted!